442 lines
10 KiB
C
442 lines
10 KiB
C
/*
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snd_mem.c
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sound caching
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/cvar.h"
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#include "QF/dstring.h"
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#include "QF/sound.h"
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#include "QF/sys.h"
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#include "QF/qendian.h"
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#include "QF/quakefs.h"
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#include "compat.h"
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#include "snd_render.h"
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typedef struct {
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byte left;
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byte right;
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} stereo8_t;
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typedef struct {
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short left;
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short right;
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} stereo16_t;
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void
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SND_ResampleMono (sfxbuffer_t *sc, byte *data, int length, void *prev)
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{
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byte *ib, *ob, *pb;
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int fracstep, outcount, sample, samplefrac, srcsample, i;
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float stepscale;
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short *is, *os, *ps;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inwidth = info->width;
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int inrate = info->rate;
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int outwidth;
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short zero_s[1];
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byte zero_b[1];
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is = (short *) data;
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os = (short *) sc->data;
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ib = data;
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ob = sc->data;
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ps = zero_s;
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pb = zero_b;
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if (!prev) {
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zero_s[0] = 0;
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zero_b[0] = 128;
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}
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os += sc->head;
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ob += sc->head;
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stepscale = (float) inrate / snd_shm->speed;
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outcount = length / stepscale;
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sc->sfx->length = info->samples / stepscale;
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//printf ("%s %d %g %d\n", sc->sfx->name, length, stepscale, sc->sfx->length);
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if (info->loopstart != (unsigned int)-1)
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sc->sfx->loopstart = info->loopstart / stepscale;
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else
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sc->sfx->loopstart = (unsigned int)-1;
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if (snd_loadas8bit->int_val) {
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sc->bps = outwidth = 1;
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sc->paint = SND_PaintChannelFrom8;
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if (prev) {
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zero_s[0] = ((char *)prev)[0];
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zero_b[0] = ((char *)prev)[0] + 128;
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}
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} else {
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sc->bps = outwidth = 2;
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sc->paint = SND_PaintChannelFrom16;
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if (prev) {
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zero_s[0] = ((short *)prev)[0];
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zero_b[0] = (((short *)prev)[0] >> 8) + 128;
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}
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}
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if (!length)
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return;
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// resample / decimate to the current source rate
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if (stepscale == 1) {
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if (inwidth == 1) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++) {
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*ob++ = *ib++ - 128;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++) {
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*os++ = (*ib++ - 128) << 8;
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}
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} else {
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goto general_Mono;
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}
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} else if (inwidth == 2) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++) {
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*ob++ = LittleShort (*is++) >> 8;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++) {
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*os++ = LittleShort (*is++);
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}
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} else {
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goto general_Mono;
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}
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}
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} else { // general case
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general_Mono:
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if (snd_interp->int_val && stepscale < 1) {
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int j;
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int points = 1 / stepscale;
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for (i = 0; i < length; i++) {
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int s1, s2;
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if (inwidth == 2) {
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s1 = LittleShort (*ps);
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s2 = LittleShort (*is);
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ps = is++;
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} else {
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s1 = (*pb - 128) << 8;
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s2 = (*ib - 128) << 8;
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pb = ib++;
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}
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for (j = 0; j < points; j++) {
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sample = s1 + (s2 - s1) * ((float) j) / points;
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if (outwidth == 2) {
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os[j] = sample;
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} else {
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ob[j] = sample >> 8;
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}
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}
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if (outwidth == 2) {
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os += points;
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} else {
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ob += points;
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}
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}
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} else {
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samplefrac = 0;
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fracstep = stepscale * 256;
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for (i = 0; i < outcount; i++) {
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srcsample = samplefrac >> 8;
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samplefrac += fracstep;
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if (inwidth == 2)
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sample = LittleShort (is[srcsample]);
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else
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sample = (ib[srcsample] - 128) << 8;
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if (outwidth == 2)
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os[i] = sample;
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else
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ob[i] = sample >> 8;
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}
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}
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}
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{
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byte *x = sc->data + sc->length * outwidth;
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if (memcmp (x, "\xde\xad\xbe\xef", 4))
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Sys_Error ("SND_ResampleMono screwed the pooch %02x%02x%02x%02x",
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x[0], x[1], x[2], x[3]);
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}
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}
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void
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SND_ResampleStereo (sfxbuffer_t *sc, byte *data, int length, void *prev)
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{
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int fracstep, outcount, outwidth, samplefrac, srcsample, sl, sr, i;
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float stepscale;
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stereo8_t *ib, *ob, *pb;
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stereo16_t *is, *os, *ps;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inwidth = info->width;
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int inrate = info->rate;
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stereo16_t zero_s;
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stereo8_t zero_b;
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is = (stereo16_t *) data;
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os = (stereo16_t *) sc->data;
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ib = (stereo8_t *) data;
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ob = (stereo8_t *) sc->data;
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ps = &zero_s;
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pb = &zero_b;
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if (!prev) {
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zero_s.left = zero_s.right = 0;
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zero_b.left = zero_b.right = 128;
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}
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os += sc->head;
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ob += sc->head;
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stepscale = (float) inrate / snd_shm->speed;
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outcount = length / stepscale;
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sc->sfx->length = info->samples / stepscale;
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if (info->loopstart != (unsigned int)-1)
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sc->sfx->loopstart = info->loopstart / stepscale;
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else
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sc->sfx->loopstart = (unsigned int)-1;
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if (snd_loadas8bit->int_val) {
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outwidth = 1;
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sc->paint = SND_PaintChannelStereo8;
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sc->bps = 2;
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if (prev) {
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zero_s.left = ((char *)prev)[0];
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zero_s.right = ((char *)prev)[1];
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zero_b.left = ((char *)prev)[0] + 128;
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zero_b.right = ((char *)prev)[1] + 128;
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}
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} else {
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outwidth = 2;
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sc->paint = SND_PaintChannelStereo16;
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sc->bps = 4;
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if (prev) {
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zero_s.left = ((short *)prev)[0];
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zero_s.right = ((short *)prev)[1];
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zero_b.left = (((short *)prev)[0] >> 8) + 128;
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zero_b.right = (((short *)prev)[1] >> 8) + 128;
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}
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}
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if (!length)
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return;
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// resample / decimate to the current source rate
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if (stepscale == 1) {
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if (inwidth == 1) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++, ob++, ib++) {
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ob->left = ib->left - 128;
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ob->right = ib->right - 128;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++, os++, ib++) {
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os->left = (ib->left - 128) << 8;
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os->right = (ib->right - 128) << 8;
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}
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} else {
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goto general_Stereo;
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}
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} else if (inwidth == 2) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++, ob++, ib++) {
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ob->left = LittleShort (is->left) >> 8;
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ob->right = LittleShort (is->right) >> 8;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++, os++, is++) {
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os->left = LittleShort (is->left);
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os->right = LittleShort (is->right);
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}
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} else {
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goto general_Stereo;
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}
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}
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} else { // general case
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general_Stereo:
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if (snd_interp->int_val && stepscale < 1) {
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int j;
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int points = 1 / stepscale;
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for (i = 0; i < length; i++) {
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int sl1, sl2;
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int sr1, sr2;
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if (inwidth == 2) {
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sl1 = LittleShort (ps->left);
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sr1 = LittleShort (ps->right);
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sl2 = LittleShort (is->left);
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sr2 = LittleShort (is->right);
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ps = is++;
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} else {
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sl1 = (pb->left - 128) << 8;
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sr1 = (pb->right - 128) << 8;
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sl2 = (ib->left - 128) << 8;
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sr2 = (ib->right - 128) << 8;
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pb = ib++;
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}
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for (j = 0; j < points; j++) {
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sl = sl1 + (sl2 - sl1) * ((float) j) / points;
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sr = sr1 + (sr2 - sr1) * ((float) j) / points;
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if (outwidth == 2) {
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os[j].left = sl;
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os[j].right = sr;
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} else {
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ob[j].left = sl >> 8;
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ob[j].right = sr >> 8;
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}
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}
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if (outwidth == 2) {
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os += points;
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} else {
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ob += points;
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}
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}
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} else {
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samplefrac = 0;
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fracstep = stepscale * 256;
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for (i = 0; i < outcount; i++) {
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srcsample = samplefrac >> 8;
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samplefrac += fracstep;
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if (inwidth == 2) {
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sl = LittleShort (is[srcsample].left);
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sr = LittleShort (is[srcsample].right);
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} else {
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sl = (ib[srcsample].left - 128) << 8;
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sr = (ib[srcsample].right - 128) << 8;
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}
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if (outwidth == 2) {
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os[i].left = sl;
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os[i].right = sr;
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} else {
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ob[i].left = sl >> 8;
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ob[i].right = sr >> 8;
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}
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}
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}
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}
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{
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byte *x = sc->data + sc->length * outwidth * 2;
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if (memcmp (x, "\xde\xad\xbe\xef", 4))
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Sys_Error ("SND_ResampleStereo screwed the pooch %02x%02x%02x%02x",
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x[0], x[1], x[2], x[3]);
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}
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}
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void
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SND_NoResampleStereo (sfxbuffer_t *sc, byte *data, int length, void *prev)
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{
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int outcount, i;
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stereo8_t *ib, *ob;
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stereo16_t *is, *os;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inwidth = info->width;
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int outwidth;
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is = (stereo16_t *) data;
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os = (stereo16_t *) sc->data;
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ib = (stereo8_t *) data;
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ob = (stereo8_t *) sc->data;
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os += sc->head;
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ob += sc->head;
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outcount = length;
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sc->sfx->length = info->samples;
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if (info->loopstart != (unsigned int)-1)
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sc->sfx->loopstart = info->loopstart;
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else
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sc->sfx->loopstart = (unsigned int)-1;
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if (snd_loadas8bit->int_val) {
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outwidth = 1;
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sc->paint = SND_PaintChannelStereo8;
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sc->bps = 2;
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} else {
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outwidth = 2;
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sc->paint = SND_PaintChannelStereo16;
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sc->bps = 4;
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}
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if (!length)
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return;
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if (inwidth == 1) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++, ob++, ib++) {
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ob->left = ib->left - 128;
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ob->right = ib->right - 128;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++, os++, ib++) {
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os->left = (ib->left - 128) << 8;
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os->right = (ib->right - 128) << 8;
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}
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}
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} else if (inwidth == 2) {
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if (outwidth == 1) {
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for (i = 0; i < outcount; i++, ob++, ib++) {
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ob->left = LittleShort (is->left) >> 8;
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ob->right = LittleShort (is->right) >> 8;
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}
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} else if (outwidth == 2) {
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for (i = 0; i < outcount; i++, os++, is++) {
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os->left = LittleShort (is->left);
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os->right = LittleShort (is->right);
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}
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}
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}
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{
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byte *x = sc->data + sc->length * outwidth * 2;
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if (memcmp (x, "\xde\xad\xbe\xef", 4))
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Sys_Error ("SND_ResampleStereo screwed the pooch %02x%02x%02x%02x",
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x[0], x[1], x[2], x[3]);
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}
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}
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